654736640 has 72 divisors (see below), whose sum is σ = 1660606920. Its totient is φ = 246480896.

The previous prime is 654736639. The next prime is 654736651. The reversal of 654736640 is 46637456.

It can be written as a sum of positive squares in 4 ways, for example, as 131974144 + 522762496 = 11488^2 + 22864^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6716 + ... + 36804.

It is an arithmetic number, because the mean of its divisors is an integer number (23063985).

Almost surely, 2^654736640 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 654736640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (830303460).

654736640 is an abundant number, since it is smaller than the sum of its proper divisors (1005870280).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

654736640 is a wasteful number, since it uses less digits than its factorization.

654736640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30127 (or 30113 counting only the distinct ones).

The product of its (nonzero) digits is 362880, while the sum is 41.

The square root of 654736640 is about 25587.8221034929. The cubic root of 654736640 is about 868.3381496592.

The spelling of 654736640 in words is "six hundred fifty-four million, seven hundred thirty-six thousand, six hundred forty".